Improvement in saw-teeth



UNITED STATES PATENT OFFICE.

JAMES R. LUGE, OF STEVENS POINT, WISCONSIN.

IMPROVEMENT IN SAW-TEETH.

Specification forming part of Letters Patent No. 211,029, dated December 17, 1878; application filed September 26, 1878.

To all whom it may concern:

Be it known that 1, JAMES Roor Loon, of Stevens Point, in the county of Portage and State of Wisconsin, have invented certain new and useful Improvements in Saw-Teeth and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to that class of circular saws'in which the teeth are provided with removable cutting-points; and it consists in the construction of the point and the means for holding the same in place, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, which form a part of this specification, and in which- Figure 1 is a side view of a part of a circular-saw plate with tooth embodying my invention. Fig. 2 shows the various parts in detail.

A represents a part of a circularsaw plate, with tooth B, formed in any of the known and usual ways. 0 represents the cutting-point, constructed substantially in the form shown, and inserted in a slot, D, made for that purpose in the tooth B.

The edges of the point 0 are made concave, or with \l-shaped grooves, to coincide with the correspondingly-shaped edges of the metal in the slot D, to prevent any lateral motion of the point. p

The butt of the cutting-point rests against a shoulder, f, formed in the bottom of the slot D, and the point is thus firmly supported in the tooth B, and held by the following means: From the bottom or inner end of the slot D extends a smaller slot, d into the saw-plate, for any suitable distance, and the inner end of this latter slot is preferably made round, as shown in Fig. 1. Into this slot (1 projects an arm, 0, extending from the inner end of the point C, the extreme end of said arm being formed with a hook, it. Between the inner end of the slot d and the shoulder f, at a suitable point, is made a circular hole, opening into the slot 61 into which hole is inserted a round key, I, having a head at one end, and

riveted at the other. Both ends of this key are countersunk into the saw-plate, so as to preserve a uniform smooth surface. This key I is formed with a central hole and groove at one end for the insertion of a suitable instrument to turn the same either tothe right or left; and it has a depression on one side, so

that the key will act as a cam, and the hook n, engaging with said cam, will hold the point C securely in its place. By turning. the key or cam I the hook will be disengaged, and the point (J can be removed.

As an additional fastening I use a spring, H, formed as shown in the drawing, to fit over the circle of the saw-plate. This spring is, at a proper point, provided with a rivetinghead, a, which is inserted and riveted in a The spring H is formed a little wider than the thickness of the saw-plate, for the purpose of preventing the sawdust from passing by, and thereby prevent the heating and wearing of the saw-plate.

Having thus fully described my invention, what I claim asnew, and desire to secure by Letters Patent, is-

In combination with a circular-saw plate, A, with teeth B, having slots D d and shoulder f, the cutting-point G, provided with the hooked arm 0 and notch d, the cam I, and

the spring H, with hook I), all constructed substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I havehereunto set my hand this 21st day of September, 1878.

JAMES noor Loon.

Witnesses:

JAMES A. FELcH, W. B. BUOKINGHAM. 

